Pencil-sharpener.



No.'84v,423. v IPATENTED MAR.19, 1-907.

5.1". MAYO.

PENCIL SHARPENER. I APPLIOATVION FILED NOV. 9. 1906.

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N 47,423; I --PATENTED MAR- 19; B 11"; MAYO.

PENCIL SHARPENBR. APPLIOATION FILED NOV. 9. 1906.

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.companying drawings, is a specification, like wheel I), fast on or forming part of the pencil- FFIGE.

BENJAMIN F. MAYO, OF SALEM, MASSAC IUSETTS, ASSIGNOR OF ONE-THIRD TO CORNELIUS J. COROORAN AND ONE-THIRD TO JAMES A. BROGAN, OF LAWRENCE, MASSACHUSETTS.

UNITE STATES PATENT PENClL-SHARPENER.

Specification of Letters Patent. Patented March 19, 1907.

Serial No. 317,670, filed May 19, 1906. This application filed November 9, 1906. Serial No- 342,604.

Gentinuation of application holder, thehub b of said gear being extended through the boss a, the latter constituting a cit] zen of the United States, and a resident of l bearing for the pencilholder. The pencil- Salem, in the county of Essex and State of l holder includes a chuck comprising a collar 0 Massachusetts, have invented an Improvewith spring-arms c, the exterior of said arms ment in Pencil-Sharpeners, of which the fol at their free ends being inclined to coact with lowing description, in connection with the acan incline at the inner end of the hub b of the pencil-holder. The collar 0 normally stands in the outer end of the hollow part of the hub of the pencil-holder, (see Fig. 6,) and a spring 0 in said hollow part and surrounding the arms of said chuck acts normally to move the chuck in such direction, as shown in Fig. 6, to cause the arms of the chuck to grasp the pencil firmly, so that as said holder is rotated the To wZZ whom it may concern:

Be it known that I, BENJAMIN F. MAYO, a

letters on the drawing representing like parts.

This invention has for its object the pro duction of a novel pencil-sharpener wherein the cutter is capable of being moved in the direction of the longitudinal axis of the pencil. The revoluble cutter is carried by a shaft mounted in a carriage movable by the operator on guides as the pencil is being sharpened, said carriage and its cutter occuying normally its inoperative position. The slidable carriage has a gear that actuates the cutter-carrying'shaft, said gear being splined on a shaft driven from the pencil-holder, said gear sliding on said shaft during the operation of sharpening a pencil.

I have also provided the machine to be herein described with a guard to protect the end of the lead as the wood of the pencil is being sharpened to point the lead.

I have also mounted the cutter in a novel manner on its carrying-shaft to provide for uniformity of position of said cutter on said shaft notwithstanding differences in thick ness of the cutter due to grinding.

Figure 1 is a top view of my novelpencilsharpener in its-inoperative position. Fig. 2 is a side elevation thereof. Fig. 3 is a detail of the carriage in end view; Fig. 4, an under side view with the cutter in its operative position; Fig. 5, a view of the machine shown in Fig. 1 looking at the same in the direction of the arrow 1; Fig. 6, a detail showing the cutter and pencil-holder, the pencil being shown as sharpened. Fig. 7 shows the chuck of the pencil-holder detached; and Fig. 8 is a partial section in the line :0 Fig. l.

Referring to the drawing, A represents a case or framework having suitable bosses at b to receive rotative members to be described. The bosses I) receive a shaft b, provided at one end in the present instance of my invention with a handle b by which to turn said shaft when a pencil is to be sharpened. This shaft has a pinion If, that engages a toothed To open the chuck that a pencil may be inserted therein, that its end to be sharpened may be brought into proper relation with the cutter to be described, I have pivoted to the framework at d a handpiece (1, the same having a hole through which the pencil is inserted as it 1s entered into the holder, and by moving said handpiece in the direction of the arrow 2 thereon, Fig. 4:, the handpiece acting against the collar 0 moves the same to-the left viewing Fig. 6, compressing the spring, so that the free ends of the springy arms 0 the collar may extend through the holder and open said throat that a pencil may be readily pushed therein to the proper distance.

As soon as the handpiece is released the spring 0 acts to move the clutch in a direction to hold the pencil firmly, so that it will be rotated by the holder as the shaft b is turned.

The framework has two rods 6, that serve ears provided with holes e to embrace said rods, said carriage having two ears 6 provided with holes to fit the shaft b. This car riage also has attached to it by a screw 0 a guide a for the end of the pencil being sharpened, and this guide is provided (see Fig. 1) with a lead-sustainer a, secured to the part 6 by a suitable screw e The lead-sustainer supports that side of the lead of the pencil being sharpened against which the cutter, to be described, acts. Between the ears a (see Figs. 1 and 5) I mount on the shaft 1) a'spiral gear 6 the same being connected with shaft b by a spline, so that said gear may be moved longitudinally on said shaft through pencil will be rotated in unison therewith as guides for a carriage e, having suitable I 15 at its face to longitudinal movement of said carriage while the shaft is being rotated. The carriage is provided with a bearing pencil-sharpener, the hand lever will be moved in a direction to To use the or piece d f, that receives the slide the chuck in the pencil-holder'in a'd-icutter-carrying shaft f, it having a spiral rection to open the same, andthe pencil will 5 worm f that is driven. by the spiral gear e The rear side of the worm contacts with an inclined part of the carriage and is held on said shaft by a suitable check-nut]? The opposite end of the shaft is provided with a in left-hand thread extended outwardly from a shoulder f The cutter 9 comprises a disk having a threaded central opening to fit the left-hand screw-threaded beyond the shoulder f said disk being cut provide a series of sharpened teeth 9 to act on and cut the wood of the pencil in pointing the same. The toothed face of the disk has a recess 9, (see Figs. 6 and 8,) the grooves forming the teeth when 2 cut in the face of the disk terminating in said recess, and consequently when the teeth are ground the grinding-wheel then acting 3 itmay be turned onto the left-hand screw- [i til the end of the wood of portionf, extended I l l l on the face of the disk said wheel will not i be pushed through said chuck and holder un the pencil enters the guide 6 of the carriage in its inoperative position. Then the operator releases the handpiece, letting the spring 0 act to clutch the pencil, and with one hand engaging the hand-lever b the shaft 7) is turned to rotate the pencil-holder, and with the other hand grasping the end of the lever g and the horn /L the carriage, through the link 9 is moved longitudinally over its guide-rods, causing the face of the cutter to act on the end of the pencil exposed in the pencil-end guide c cutting the wood of said revolving pencil as the cutter is revolved, forming a conical point, and gradually as the cutter is moved and the spring g is stretched the cutter comes to its full action on the pencil and its lead and sharpens the same. This application is intended as a continuation of application, Serial No. 317,670, filed May 19, 1906, which application has been discontinued and this application filed instead.

Having fully described my invention, What I claim as new, and desire to secure by Letthread until the toothed face of the cutter at r n i the inner end of the teeth abut the shoulder f, the diameter of which is enough larger than the diameter of'the recess 9 to preclude 3 5 the entrance of said shoulder into said recess,

and. as the cutter-shaft is rotated the tendency i is always to screw the cutter onto the shaft, anddue to the fact that the toothed sideof the central part of the cutter abuts said 4 shoulder the teeth of the cutter, whatever its thickness due to grinding, always occupy the same position with relation to the parts holding the end of the pencil being sharpened in the carriage e. The bearingj'for the cutter-carrying shaft is adapted to sustain said shaft at an angle to the guide-rods on which the carriage moves, and viewing Figs. 1 and 4 it will be noticed that the acting face of the cutter occupies such position, due to the in 5 clination of its shaft in the carriage, that the face of the cutter revolves in a plane thatintersects and crosses the longitudinal axis of the pencil. The carriage hasa stud g, that is embraced by a link 9 connected with a lever 9 pivoted at 9 the end of the lever being projected through a suitable hole in the framework and shaped as a linger-piece. The lever g has connected with it within the casing one end of a spiral spring 9", the opposite end of which is connected with a stud g of the framework, so that said spring acts normally to keep the carriage in its inoperative position, Fig. 1. The exterior of the framework is provided with a hand-rest 1. In a pencil-sharpener, pencil-holding means a shaft occupying a position in and at an angle to the longitudinal axis of the pencil and having a rotatable cutter provided with radial teeth, and means to move the shaft of the cutter in the direction of the length or the pencil held by the pencil-holding means.

2. In a peneilsharpener, a carriage, means to sustain the same, a pencil-holder, means to revolve the same, a shaft sustained in said carriage and provided with a rotatable-cutter having a series of radial teeth that cross the longitudinal axis of the'pencil held by the pencil-holding means.

3. In a pencil-sharpener, a pencil-holder comprising a clutch to embrace'and hold a pencil, a carriage having a shaft provided with a cutter and with an end guide for the pencil, a lever, and a spring, the springacting normally to maintain said. carriage and cutter in its inoperative position, the movement of the lever in. opposition to the spring permitting the carriage to be put into its opera tive position.

4. In a encil-sharpener, a rotatable shaft having spfined thereon a spiral gear, a carriage having a shaft provided with acutter, and a spiral pinion that is engaged and driven by said spiral gear, means to sustain said carriage, and means to move the same longitudinally, the carriage moving with it the spiral gear on its carrying-shaft, said spiral gear rotating said spiral pinion in any position'of the carriage.

5. In a pencil-sharpener, a cutter-carrying shaft having a shoulder and a screw-threaded portion bey 0nd said shoulder, combined with a cutter having radial teeth, the thread uniting the cutter to said shaft being in a direction reverse of the direction of rotation of said shaft.

6. In a penc1lsharpener, a cutter-carrying shaft having a shoulder and a screw-threaded boss beyond said shoulder, combined With a cutter having radial teeth at one of its faces, said cutter being screw-threaded to fit said. boss, the center of the face of the cutter having radial teeth abutting said shoulder.

7. In a pencil-sharpener, a carriage, means to sustain and guide the same, a cutter-carrying shaft mounted in said carriage, said shaft being inclined With relation to the means for sustaining and guiding said oarriage.

8. In a pencil-sharpener, pencil-holding means, means to revolve the pencil, a carriage, means to sustain and guide the same,

a cutter-carrying shaft mounted in said carriage, said shaft being inclined with relation to the means for sustaining and guiding said. carriage.

9. In a pencil-sharpener, a carriage, means to sustain the same, a cutter carried by said carriage, a horn and a lever, the movement of the lever toward said horn moving said carriage in a direction to cause the cutter to sharpen a pencil. v

10. In a pencil-sharpener, a pencil-holder and a cutter-carrying shaft having a shoulder combined with a cutter having teeth at one side abutting said shoulder and means to confine said cutter on said shaft.

In testimony whereof I have signed my name to this specification in the presence of tWo subscribing Witnesses.

BENJAMIN F. MAYO.

I/Vitnesses:

GEO. W. GREGORY, MARGARET A: DUNN. 

